Urgent help needed: add transparency to image

MacNeXT

macrumors 6502
Original poster
Jun 21, 2004
258
0
Hi

I'm making a keynote and I want to use some images that are JPEG with white background. Is it possible to convert the white background to transparent? I think I need some kind of flood fill because white is also present in the image itself, only the surrounding white has to be converted.

I don't have photoshop. Are there any free tools available for this? Any help is appreciated!
 

MacDawg

macrumors Core
Mar 20, 2004
19,709
4,278
"Between the Hedges"
MacNeXT said:
Hi

I'm making a keynote and I want to use some images that are JPEG with white background. Is it possible to convert the white background to transparent? I think I need some kind of flood fill because white is also present in the image itself, only the surrounding white has to be converted.

I don't have photoshop. Are there any free tools available for this? Any help is appreciated!
I don't believe that .jpg supports transparency (but I could be wrong).
You may have to convert them to .gif and set the transparency.
You may also need to fill the white you want to keep with a different color.

Graphic Converter X should be able to help.

Woof, Woof - Dawg
 

robbieduncan

Moderator emeritus
Jul 24, 2002
24,596
60
Harrogate
As noted above JPEG does not support opacity at all. Depending on your image GIF may not be a suitable option. Other options include TIFF or PNG which both support opacity and allow for photo-level colours.
 

wheezy

macrumors 65816
Apr 7, 2005
1,280
1
Alpine, UT
Go for PNG, better quality than a .gif, and Keynote will support it. JPEG does not support the transparency layer.
 

emw

macrumors G4
Aug 2, 2004
11,177
0
I think you can use GraphicConverter's Transparent tool to convert white areas to transparent. This app should be included on your Mac.
 

robbieduncan

Moderator emeritus
Jul 24, 2002
24,596
60
Harrogate
emw said:
I think you can use GraphicConverter's Transparent tool to convert white areas to transparent. This app should be included on your Mac.
Pro line Macs only (i.e. PowerBook and PowerMac only).